Odpowiedź:
1. I am learning the piano at the moment.
2. How often do you get together with your friends?
3. We don't usually study together.
4. Is Katie watching TV now?
5. Harry doesn't often wear colorful clothes.
6. My parents eat in a restaurant once a week.
7. Are you working hard these days?
8. I am not looking at my phone today!
Wyjaśnienie:
Zwyczaje (often,usually, once a week) łączymy z present simple.
Sytuacje tymczasowe (these days, today), coś co dzieje się w tym momencie (now, at the moment) łączymy z present continuous.